How to get this type of relief?
I would do it manually:


Put your picture as a background image.
Create a plane, begin to follow the shape of the object with some extrusions.
When you have finished, create some edge loops on the centre of each quads line, where the bump is supposed to happen.
drag the edge loops to create the bump.
Give your object a Subdivision Surface modifier, and click the Smooth Shading button to smooth it.